Store [-webkit-]perspective-origin as a LengthPoint.

Source/core/rendering/style/StyleRareNonInheritedData.cpp

Index: Source/core/rendering/style/StyleRareNonInheritedData.cpp
diff --git a/Source/core/rendering/style/StyleRareNonInheritedData.cpp b/Source/core/rendering/style/StyleRareNonInheritedData.cpp
index ff1f735b7e95dca5ad607832f1e8bb5a0f24b26e..8545854970471e638e76c605d35edf8e3817411e 100644
--- a/Source/core/rendering/style/StyleRareNonInheritedData.cpp
+++ b/Source/core/rendering/style/StyleRareNonInheritedData.cpp
@@ -36,8 +36,7 @@ StyleRareNonInheritedData::StyleRareNonInheritedData()
     : opacity(RenderStyle::initialOpacity())
     , m_aspectRatio(RenderStyle::initialAspectRatio())
     , m_perspective(RenderStyle::initialPerspective())
-    , m_perspectiveOriginX(RenderStyle::initialPerspectiveOriginX())
-    , m_perspectiveOriginY(RenderStyle::initialPerspectiveOriginY())
+    , m_perspectiveOrigin(RenderStyle::initialPerspectiveOrigin())
     , lineClamp(RenderStyle::initialLineClamp())
     , m_draggableRegionMode(DraggableRegionNone)
     , m_mask(MaskFillLayer, true)
@@ -102,8 +101,7 @@ StyleRareNonInheritedData::StyleRareNonInheritedData(const StyleRareNonInherited
     , opacity(o.opacity)
     , m_aspectRatio(o.m_aspectRatio)
     , m_perspective(o.m_perspective)
-    , m_perspectiveOriginX(o.m_perspectiveOriginX)
-    , m_perspectiveOriginY(o.m_perspectiveOriginY)
+    , m_perspectiveOrigin(o.m_perspectiveOrigin)
     , lineClamp(o.lineClamp)
     , m_draggableRegionMode(o.m_draggableRegionMode)
     , m_deprecatedFlexibleBox(o.m_deprecatedFlexibleBox)
@@ -190,8 +188,7 @@ bool StyleRareNonInheritedData::operator==(const StyleRareNonInheritedData& o) c
     return opacity == o.opacity
         && m_aspectRatio == o.m_aspectRatio
         && m_perspective == o.m_perspective
-        && m_perspectiveOriginX == o.m_perspectiveOriginX
-        && m_perspectiveOriginY == o.m_perspectiveOriginY
+        && m_perspectiveOrigin == o.m_perspectiveOrigin
         && lineClamp == o.lineClamp
         && m_draggableRegionMode == o.m_draggableRegionMode
         && m_deprecatedFlexibleBox == o.m_deprecatedFlexibleBox